The Dundee United playmaker was called into the squad for the first time after a string of fine performances for his club.
The 17-year-old was then thrust straight into the side for Thursday's European Championship qualifier in Paisley.
Gauld believes he probably earned pass marks on the night but insists he can do better.
He said: "I was delighted to get my first start for the Under-21s.
"It was against a good team so it was a good experience for me.
"I think I coped okay. I know I can do better but it wasn't too bad for a first game."
Gauld admits he did not expect to see his name on the team-sheet, adding: "I was very surprised. I wasn't even expecting to be in the squad.
"To be in the starting line-up, I was very happy about that. I just tried to play my best.
"I found out I was starting just before the game, earlier in the day. I had a bit of time to focus on the game.
"I try not to be nervous about games. I look forward to them and try to enjoy them."
Gauld says he was helped by the presence of United club-mates Andrew Robertson and Stuart Armstrong.
He said: "It was great because they have been here before and they know what's going on and they helped to look after me.
"It was good to have a couple of familiar faces."
The young Scots fought back from behind to rescue a point when Callum Paterson came off the bench to cancel out Georgi Chanturia's opener with a late leveller.
The result allowed Billy Stark's side to remain level with Georgia on seven points, with joint leaders Holland and Slovakia tied on 10 points.
Gauld said: "It was what we deserved, especially with the way we played in the second half.
"It was good to come away with at least a point because we would have been devastated if it was 1-0 to Georgia.
"We could have done with a win and another three points but at least we didn't get beat.
"We are still level with Georgia and we've just got to look to the next game now.
"If we had won, we would have been just off the top and that's disappointing.
"But we're not out of it yet. We are still in touching distance so we just have to keep going."